print("hello world")
print("hello world")
print("hello world")
type_str = type("hello world")
print(type_str)
print(f"第一个{1+1},第二个{1+2}")
print("表达式1 %d, %.1f, %s " % (1+1, 1+2.3, "a"+ 'b'))

name = input("你是？？") # 等待键盘输入  默认都是字符串
print("我是：%s" % name)
age = type(123) #int
str_age = str(123)
money = type(123.12) # float
print(age,  money, type(str_age)) #<class 'int'> <class 'float'> <class 'str'>













